Soda Tak claims that Diet Tak has 40mg of sodium per can. You work for a consumer organization that tests such claims. You take a random sample of 60 cans and find that the mean amount of sodium in the sample is 42.4mg. The standard deviation in all cans is 7.2mg. You suspect that there is more than 40mg of sodium per can. Find the z-score.

0.2

2.582

2.727

5.143

Question

Soda Tak claims that Diet Tak has 40mg of sodium per can. You work for a consumer organization that tests such claims. You take a random sample of 60 cans and find that the mean amount of sodium in the sample is 42.4mg. The standard deviation in all cans is 7.2mg. You suspect that there is more than 40mg of sodium per can. Find the z-score.

 0.2

 2.582

 2.727

 5.143

poopsiedoodle · Answer

@Compassionate

agent0smith · Answer

z = ( x - mean )/st.dev

where x is the score, 40mg here

agent0smith · Answer

hmm. That doesn't seem an option.

anonymous · Answer

haha

anonymous · Answer

so 60-42.4/40?

anonymous · Answer

@agent0smith ?

agent0smith · Answer

z = ( x - mean )/st.dev

where x is the score, 40mg here

mean and st dev are given

anonymous · Answer

B

anonymous · Answer

since 
42.4-40/7.2?

agent0smith · Answer

That works out to 1/3, which is why idk. Maybe it's something to do with sample mean, idk

anonymous · Answer

alrighty well cna you help me with 5 more?

anonymous · Answer

i need to know this :( please help